|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of impregnation strategy on catalytic hydrogenation behavior of PtCo catalysts supported on La2O2CO3 nanorods显示文摘Small Pt and Pt-Co nanoparticles(NPs) stabilized on La_2 O_2 CO_3 nanorods(LOC) were prepared by wet impregnation method,and probed in liquid-phase chemoselective hydrogenation of crotonaldehyde(CRAL) to crotyl alcohol(CROL).It is found that incorporation of Co atoms into Pt catalyst significantly improves the hydrogenation activity and desired selectivity to CROL as it destroys the Pt-lanthanum interfaces and results into the formation of Pt-Co particles.In addition,a close examination of catalyst surface and reactive performance suggests that the impregnation sequence of Pt and Co exerts great influence on the physicochemical property and the catalytic hydrogenation behavior of PtCo/LOC catalysts.As a result of the interaction between Pt and Co species,high alloying degree of Pt-Co NPs is obtained in the co-impregnated catalyst(Pt-Co/LOC),thus achieving the highest hydrogenation activity.The selective deposit of Co atoms onto the low-coordinated Pt sites leads to the smallest metal particle size and high dispersion of Pt-Co NPs over the Pt/Co/LOC,giving rise to the highest selectivity and yield to CROL. | Fengjun Hou Huahua Zhao Huanling Song Lingjun Chou Jun Zhao Jian Yang Liang Yan | 2018 | Journal of Rare Earths2018，36，9： | 4 |
| 2 | METHOD OF MULTI-TARGET TRACKING IN WIDE AREA SURVEILLANCE AIRBORNE RADAR SYSTEM BASING ON CLUSTERING ANALYSIS显示文摘This paper proposed a robust method based on the definition of Mahalanobis distance to track ground moving target. The feature and the geometry of airborne ground moving target tracking systems are studied at first. Based on this feature, the assignment relation of time-nearby target is calculated via Mahalanobis distance, and then the corresponding transformation formula is deduced. The simulation results show the correctness and effectiveness of the proposed method. | Wu Kun Zhao Fengjun Hui Zhou Zheng Shichao Zheng Mingjie | 2014 | Journal of Electronics(China)2014，31，3： | 3 |
| 3 | Late Cretaceous-Cenozoic Multi-Stage Denudation at the Western Ordos Block: Constraints by the Apatite Fission Track Dating on the Langshan显示文摘The apatite fission track dating of samples from the Dabashan(i.e., the Langshan in the northeastern Alxa Block) by the laser ablation method and their thermal history modeling of AFT ages are conducted in this study. The obtained results and lines of geological evidence in the study region indicate that the Langshan has experienced complicated tectonic-thermal events during the the Late Cretaceous-Cenozoic. Firstly, it experienced a tectonic-thermal event in the Late Cretaceous(~90–70 Ma). The event had little relation with the oblique subduction of the Izanagi Plate along the eastern Eurasian Plate, but was related to the Neo-Tethys subduction and compression between the Lhasa Block and Qiangtang Block. Secondly, it underwent the dextral slip faulting in the Eocene(~50–45 Ma). The strike slip fault may develop in the same tectonic setting as sinistral slip faults in southern Mongolia and thrusts in West Qinling to the southwest Ordos Block in the same period, which is the remote far-field response to the India-Eurasia collision. Thirdly, the tectonic thermal event existed in the late Cenozoic(since ~10 Ma), thermal modeling shows that several samples began their denudation from upper region of partial annealing zone(PAZ), and the denudation may have a great relationship with the growth of Qinghai-Tibetan Plateau to the northeast. In addition, the AFT ages of Langshan indicate that the main body of the Langshan may be an upper part of fossil PAZ of the Late Cretaceous(~70 Ma). The fossil PAZ were destroyed and deformed by tectonic events repeatedly in the Cenozoic along with the denudation. | CUI Xianyue ZHAO Qihua ZHANG Jin WANG Yannan ZHANG Beihang NIE Fengjun QU Junfeng ZHAO Heng | 2018 | Acta Geologica Sinica(English Edition)2018，92，2： | 3 |
| 4 | SPACEBORNE SAR REAL-TIME ECHO SIMULATION PLATFORM BASED ON VPX显示文摘To perform the ground test of a spaceborne Synthetic Aperture Radar(SAR) system, an echo simulator with the characteristics of multimode, multi-assemblage, and real time is proposed in this paper. A hardware platform of the real-time echo simulator based on the VPX bus is designed. With this platform, real-time multi-point echo generation and scenario targets echo generation can be achieved by the real-time signal processing in Field Programmable Gate Array(FPGA), utilizing the parameters calculated by the industry computers. Furthermore, this platform can output different signals if it is expanded to multi-channels, making it possible for the assignment of echo generation and test in different spaceborne SAR modes. The test results with the actual SAR system show that this platform can satisfy the system requirements and is now used in practice. | Ni Chao Hu Xiao Zhang Zhimin Zhao Fengjun | 2014 | Journal of Electronics(China)2014，31，3： | 2 |
| 5 | The impact of climate change on fire risk in Daxing'anling,China显示文摘Daxing'anling is a key region for forest fire prevention in China.Assessing changes in fire risk in the future under multiple climatic scenarios will contribute to our understanding of the influences of climate change for the region and provide a reference for applying adaptive measures for fire management.This study analyzed the changes in fire weather indices and the fire season under four climate scenarios(RCP2.6,RCP4.5,RCP6.0,RCP8.5)for 2021–2050 using data from five global climate models together with observation data.The results showed that the analog data could project the average state of the climate for a given period but were not effective for simulating extreme weather conditions.Compared with the baseline period(1971–2000),the period 2021–2050 was predicted to have an increase in average temperature of 2.02–2.65 °C and in annual precipitation 25.4–40.3 mm,while the fire weather index(FWI) was predicted to increase by6.2–11.2% and seasonal severity rating(SSR) by5.5–17.2%.The DMC(Duff moisture code),ISI(initial spread index),BUI(build-up index),FWI and SSR were predicted to increase significantly under scenarios RCP4.5,RCP6.0,and RCP8.5.Furthermore,days with high or higher fire danger rating were predicted to be prolonged by 3–6 days,with the change in the southern region being greater under scenarios RCP4.5,RCP6.0,and RCP8.5. | Xiaorui Tian Lifu Shu Mingyu Wang Fengjun Zhao | 2017 | Journal of Forestry Research2017，28，5： | 2 |
| 6 | Dynamic Task Offloading for Mobile Edge Computing with Hybrid Energy Supply显示文摘Mobile edge computing(MEC),as a new distributed computing model,satisfies the low energy consumption and low latency requirements of computation-intensive services.The task offloading of MEC has become an important research hotspot,as it solves the problems of insufficient computing capability and battery capacity of Internet of things(IoT)devices.This study investigates task offloading scheduling in a dynamic MEC system.By integrating energy harvesting technology into IoT devices,we propose a hybrid energy supply model.We jointly optimize local computing,offloading duration,and edge computing decisions to minimize system cost.On the basis of stochastic optimization theory,we design an online dynamic task offloading algorithm for MEC with a hybrid energy supply called DTOME.DTOME can make task offloading decisions by weighing system cost and queue stability.We quote dynamic programming theory to obtain the optimal task offloading strategy.Simulation results verify the effectiveness of DTOME,and show that DTOME entails lower system cost than two baseline task offloading strategies. | Ying Chen Fengjun Zhao Yangguang Lu Xin Chen | 2023 | Tsinghua Science and Technology2023，28，3： | 1 |
| 7 | Supercritical extracts of forest fuels in Great Xing'an Mountains显示文摘Extracts are important components of fuels.Fatty-extracts with high heating value(HV) are hypothesized by researchers as positively related to the HV of fuels.The Soxhlet extractor is typically used to extract fatty-extracts but it has shortcomings,including long processing time(8–10 h) and the requirement for large amounts of organic solvent.Supercritical extraction is an alternate and useful technique for extraction of natural products.However,published studies rarely discuss the relationship between extracts and HV.In this study,we assessed the supercritical extracts(Su E) of forest fuels in the Great Xing'an Mountains.Our results indicated that the optimum conditions for extraction of Su Es were40–60 mesh,40–50 MPa,45 °C,80 min and a CO_2 flow rate of 1.5–2.0 dm^3/min.The Soxhlet extracts contents and the Su E contents were all related to HV.However,R^2 of the coniferous samples(0.8499) and needle samples(0.9722) demonstrated that the correlation between HV and the Su E content was closer.We conclude that supercritical fatty-extracts provide a useful index of the HV of fuels,especially coniferous fuels.Su E data can be used in fire management,for example to estimate the rate of fire spread or fire intensity. | Fengjun Zhao Mingyu Wang Lifu Shu Xiaorui Tian Kezhen Liu | 2016 | Journal of Forestry Research2016，27，5： | 1 |
| 8 | Foliar Carbon Isotope Composition δ(^13C)) and Water Use Efficiency of Different Populus Deltoids Clones Under Water Stress显示文摘 | ZHAO Fengjun GAO Rongfu SHEN Yingbai | 2006 | Front For China2006，，1： | 1 |
| 9 | Camera Calibration from Video of a Walking Human显示文摘 | Fengjun Lv Tao Zhao Ramakant Nevatia | 2006 | IEEE Transactions on Pattern Analysis and Machine Intelligence2006，28，9： | 1 |
| 10 | Determination of essential and toxic dements in CordycepskyushuensisKawam by inductively coupled plasma mass spectrometry显示文摘 | Guoying Zhang Yanxin Zhao Fengjun Liu | 2013 | Journal of Pharmaceutical and Biomedical Analysis2013，72，18： | 1 |
| 11 | Leaching ofheavy metals from contaminated soils using EDTA显示文摘 | Sun Bo Zhao Fengjun Lombi E | 2001 | Environmental Pollution2001，113，2： | 1 |
| 12 | GCR-Net:3D Graph convolution-based residual network for robust reconstruction in cerenkov luminescence tomography显示文摘Cerenkov Luminescence Tomography(CLT)is a novel and potential imaging modality which can display the three-dimensional distribution of radioactive probes.However,due to severe ill-posed inverse problem,obtaining accurate reconstruction results is still a challenge for traditional model-based methods.The recently emerged deep learning-based methods can directly learn the mapping relation between the surface photon intensity and the distribution of the radioactive source,which effectively improves the performance of CLT reconstruction.However,the previously proposed deep learning-based methods cannot work well when the order of input is disarranged.In this paper,a novel 3D graph convolution-based residual network,GCR-Net,is proposed,which can obtain a robust and accurate reconstruction result from the photon intensity of the surface.Additionally,it is proved that the network is insensitive to the order of input.The performance of this method was evaluated with numerical simulations and in vivo experiments.The results demonstrated that compared with the existing methods,the proposed method can achieve efficient and accurate reconstruction in localization and shape recovery by utilizing threedimensional information. | Weitong Li Mengfei Du Yi Chen Haolin Wang Linzhi Su Huangjian Yi Fengjun Zhao Kang Li Lin Wang Xin Cao | 2023 | Journal of Innovative Optical Health Sciences2023，16，1： | 0 |
| 13 | Southeast Tibet Forest Fuel Types and Flammability显示文摘Southeast Tibet forest is in east subtropical zone. This region natural environment is unique, influenced by the southwest monsoon, so forest fires are very easy to occur in the dry season. Forest in this region is over mature forest, and accounts for much proportion. Fire season in this area is winter and spring. But in the special year, forest fires can also occur in the hot summer. Fire season lasts from October to next February, but to April in an individual arid year. Most of the fires in this area are surface fires, crown fires can occur after long time drought. Ground fires do not occur in the region. | SHU Lifu ZHAO Fengjun WANG Mingyu LIU Xiaodong WANG Jingsheng | 2007 | Chinese Forestry Science and Technology2007，6，1： | 0 |
| 14 | Monitoring Forest Fire with MODIS-NDVI Images in Beijing显示文摘Fuel moisture monitoring is an important component of fire danger rating system in fire management. This paper describes the application of NDVI images in monitoring potential fire danger and analyses the relationship between MODIS-NDVI and fire weather index. The series of weather data in Beijing are used in this analysis including fire seasons in spring during 2004 to 2005. Canadian Fire Weather Index (FWI) is selected in this study, because it can properly estimate moisture conditions of live fuel. Fine fuel moisture, drought code and FWI values are generated by using the squared inverse distance algorithm. Strong correlations have previously been observed between FWI variables and NDVI data. The MODIS-NDVI images can be used in fire management as component related with live fuel moisture and fire danger. | TIAN Xiaorui SHU Lifu WANG Mingyu ZHAO Fengjun | 2006 | Chinese Forestry Science and Technology2006，5，4： | 0 |
| 15 | The influence of the corporate social responsibility disclosures on consumer brand attitudes under the impact of CO VID-19显示文摘This study focuses on the use of we-media by small-and medium-sized enterprises(SMEs)to disclose internal corporate social responsibility(ICSR)under the impact of the 2019 novel coronavirus disease(COVID-19).Study 1 interprets the catalyst effect of COVID-19 on the externalization of SMEs'ICSR.The fuzzy grading evaluation method is initially verified.Under the impact of COVID-19,SMEs fulfilling their ICSR can enhance consumer brand attitudes.Study 2 uses a structural equation model and empirical analysis of 946 effective samples and finds that consumers perceive the self-sacrifice of corporations during the coronavirus disease period.SMEs can fulfill their ICSR to enhance the internal explanation mechanism of consumer brand attitudes and the moderating role of enterprise losses. | Fengjun Liu Lu Meng Yijun Zhao Shen Duan | 2020 | Frontiers of Business Research in China2020，14，4： | 0 |
| 16 | Effect of Freezing Snow Disaster on Forest Fuel and Fire Behavior in Southern China显示文摘After freezing snow disaster,stands of Pinus massoniana,Cunninghamia lanceolata. Liquidambar formosana,Cinnamomum camphora and Phyllostachys pubescens and new burned areas in Hunan Province were surveyed by setting field plots.Moisture content and fuel load were measured by sampling and fire behavior(such as rate of fire spread) was calculated.The results showed that fuel load got doubled instantly,fuel thickness enhanced,fuel continuity swelled and water content of fuel decreased as shrubs and herbs die... | WANG Qiuhua~1 SHU Lifu~(1**) DAI Xing’an~2 WANG Mingyu~1 ZHAO Fengjun~1 1.Research Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry,Beijing 100091,P.R.China 2.Central South Forestry Science and Technology University,Changsha 410000,P.R.China | 2009 | Chinese Forestry Science and Technology2009，8，2： | 0 |
| 17 | A novel denoising framework for cerenkov luminescence imaging based on spatial information improved clustering and curvature-driven diffusion显示文摘With widely availed clinically used radionuclides,Cer enkov luminescence imaging(CLI)has become a potential tool in the field of optical molecular imaging.However,the impulse noises introduced by high-energy gamma rays that are generated during the decay of radionuclide reduce the image quality significantly,which affects the acauracy of quantitative analysis,as well as the three dimensional reconstruction.In this work,a novel denoising framework based on fuzzy dlustering and curvat ure driven difusion(CDD)is proposed to remove this kind of impulse noises.To improve the accuracy,the F u1zzy Local Information C-Means algorithm,where spatial information is evolved,is used.We evaluate the per formance of the proposed framework sys-tematically with a series of experiments,and the corresponding results demonstrate a better denoising effect than those from the commonly used median filter method.We hope this work may provide a useful data pre processing tool for CLI and its following studies. | Xin Cao Yi Sun Fei Kang Lin Wang Huangjian Yi Fengjun Zhao Linzhi Su Xiaowei He | 2018 | Journal of Innovative Optical Health Sciences2018，，4： | 0 |
| 18 | Performance evaluation of the simpli¯ed spherical harmonics approximation for cone-beam X-ray luminescence computed tomography imaging显示文摘As an emerging molecular imaging modality,cone-beam X-ray luminescence computed tomog-raphy(CB-XLCT)uses X-ray-excitable probes to produce near-infrared(NIR)luminescence and then reconst ructs three-dimensional(3D)distribution of the probes from surface measurements.A proper photon-transportation model is critical to accuracy of XLCT.Here,we presented a systematic comparison between the common-used Monte Carlo model and simplified spherical harmonics(SPN).The performance of the two methods was evaluated over several main spec-trums using a known XLCT material.We designed both a global measurement based on the cosine similarity and a locally-averaged relative error,to quantitatively assess these methods.The results show that the SP_(3) could reach a good balance between the modeling accuracy and computational efficiency for all of the tested emission spectrums.Besides,the SP_(1)(which is equivalent to the difusion equation(DE))can be a reasonable alternative model for emission wavelength over 692nm.In vivo experiment further demonstrates the reconstruction perfor-mance of the SP:and DE.This study would provide a valuable guidance for modeling the photon-transportation in CB-XLCT. | Haibo Zhang Guohua Geng Yanrong Chen Fengjun Zhao Yuqing Hou Huangjian Yi Shunli Zhang Jingjing Yu Xiaowei He | 2017 | Journal of Innovative Optical Health Sciences2017，，3： | 0 |
| 19 | Point-defect-driven flattened polar phonon bands in fluorite ferroelectrics显示文摘The scale-free ferroelectric polarization of fluorite MO_(2)(M=Hf,Zr)due to flat polar phonon bands are promising for nonvolatile memories.Defects are also widely introduced to improve the emergent ferroelectricity.However,their roles are still not fully understood at the atomic-level.Here,we report a significant effect of point-defect-driven flattening of polar phonon bands with more polar modes and polarization contribution in doped MO_(2).The polar phonon bands in La-doped MO_(2)(M=Hf,Zr)can be significantly flattened,compared with pure ones.However,the lower energy barrier with larger polarization of VO-only doped MO_(2) compared with La-doped cases suggest that VO and local lattice distortion should be balanced for high-performance fluorite ferroelectricity.The work is believed to bridge the relation between point defects and the generally enhanced induced ferroelectricity in fluorite ferroelectrics at the atomic-level and inspire their further property optimization via defect-engineering. | Pu Ai Fengjun Yan Wen Dong Shi Liu Junlei Zhao Kan-Hao Xue Syed Ul Hasnain Bakhtiar Yilong Liu Qi Ma Ling Miao Mengyuan Hua Guangzu Zhang Shenglin Jiang Wei Luo Qiuyun Fu | 2023 | npj Computational Materials2023，，1： | 0 |
| 20 | Forest Fire Environment and Characteristics in Northeastern China显示文摘Forest fires occurrence is influenced by many factors, such as inter-annual weather variations and regional fuel distributions. Fires occurrence in different forest region has distinct spatial and temporal characteristics. The paper studied the natural forest fire environment in Northeastern China, as well as forest fires occurrence, burned area and fire seasons in Northeastern Forest Region. The result shows that more than 50% of annual burned area occurred in Northeast China Forest Region. Main fire seasons in the region are spring and autumn. Fires occurrence in spring is larger than that in autumn. There are few fires in summer. The authors' suggestions for fire management department are to emphasize the fuel management, improve the roads conditions, and enhance the fires control ability. | ZHAO Fengjun SHU Lifu WANG Mingyu LIU Xiaodong | 2007 | Chinese Forestry Science and Technology2007，6，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员